A Fiber Bragg Grating Sensing Demodulation Device Based on Microwave Mixing Technology
A fiber grating and sensing solution technology, which is applied in the direction of using optical devices to transmit sensing components, measuring devices, and converting sensor outputs, can solve the problems of poor environmental adaptability, unstable resolution, etc., and achieve high stability.
Active Publication Date: 2022-07-15
深圳市光比纳通信有限公司
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to overcome the defects of poor environmental adaptability, instability and low resolution in the working process of the existing demodulation device, and provide a fiber grating sensing demodulation device based on microwave frequency mixing technology, thereby solve the above problems
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[0019] Example: as figure 1 As shown, the present invention provides a fiber grating sensing demodulation device based on microwave mixing technology, including a narrow linewidth distributed feedback (DFB) laser 101, a fiber grating 109 and an IQ mixer 203. The output end of the feedback (DFB) laser 101 is connected to the polarization-maintaining fiber coupler 102, and the output light of the polarization-maintaining fiber coupler 102 enters the single-mode fiber coupler 106 after passing through the intensity light modulator 104, and the single-mode fiber coupler 106 outputs The terminal is divided into a large output terminal and a small output terminal. The output light of the large output terminal reaches the high-speed photodetector 201 after passing through the optical fiber circulator 107, and the output light of the small output terminal reaches the modulation driver 105 through the photodetector 103. A part of the output light of the coupler 102 also passes through ...
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Abstract
The invention discloses a fiber grating sensing demodulation device based on microwave frequency mixing technology, comprising a narrow line width distributed feedback (DFB) laser, a fiber grating and an IQ mixer. The output end of the narrow line width distributed feedback laser is connected to The polarization-maintaining fiber coupler, the output light of the polarization-maintaining fiber coupler enters the single-mode fiber coupler after passing through the intensity-type optical modulator, the signal of the signal source is loaded on the intensity-type optical modulator, and then the signal passes through the high-speed photodetector The microwave input end of the IQ mixer is reached, and the output end of the IQ mixer is connected to the signal processing and display module. The fiber grating sensing system uses the microwave mixer for direct signal demodulation, and the measurement result of the wavelength shift has extremely high performance. stability.
Description
technical field [0001] The invention relates to a demodulation device, in particular to a fiber grating sensing demodulation device based on microwave mixing technology. Background technique [0002] Fiber grating sensor (Fiber Grating Sensor) belongs to a kind of fiber optic sensor. The sensing process based on fiber grating is to obtain sensing information by modulating the fiber Bragg wavelength by external physical parameters. It is a wavelength modulation fiber optic sensor. . [0003] At present, fiber grating sensing demodulation systems mainly include spectroscopy, multi-wavelength meter detection, edge filtering, tunable optical filtering, matching grating detection, wavelength tunable light source demodulation, CCD spectrometer detection and Michelson Interference demodulation and other methods. The analysis range of the spectroscopic method is relatively small, the multi-wavelength meter detection method has strict operating conditions, the tunable optical filte...
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IPC IPC(8): G01D5/353
CPCG01D5/35316
Inventor 卢平
Owner 深圳市光比纳通信有限公司